Blind multiuser detection with probabilistic algorithms - application to underwater communications
Document typeConference report
Rights accessOpen Access
In this paper, two probabilistic adaptive algorithms for jointly detecting active users in a DS-CDMA system are compared. The first one, which is based on the theory of hidden Markov models (HMM) is proposed within the CDMA scenario and compared with the previously developed Viterbi-based algorithm. Both techniques are completely blind in the sense that no knowledge of the signature sequences, channel state information or training sequences is required for any user. After convergence, an estimate of the signature of each user convolved with its physical channel impulse response (CIR), and estimated data sequences are provided. This CIR estimate can then be used to switch to any decision-directed (DD) adaptation scheme. Performance of the algorithms is verified with simulations as well as with experimental data from an underwater acoustics (UWA) environment. In both cases, performance is found to be highly satisfactory, showing the near-far resistance of the analyzed algorithms.
CitationAnton, C., Fonollosa, José A. R., Zvonar, Z., R. Fonollosa, Javier. Blind multiuser detection with probabilistic algorithms - application to underwater communications. A: IEEE International Conference on Acoustics, Speech and Signal Processing "ICASSP 1997: IEEE International Conference on Acoustics, Speech and Signal Processing: Munich, Germany: April 21-24, 1997". Munich: IEEE IEEE, 1997, p. 3889-3893.
ISBN0 646 313037